Accession Number : AD0634140

Title :   WEIGHT SAVINGS DERIVED FROM THE USE OF CONTRASTING MATERIALS IN CONVENTIONALLY STIFFENED CYLINDERS,

Corporate Author : LOCKHEED MISSILES AND SPACE CO PALO ALTO CALIF RESEARCH LABS

Personal Author(s) : Burns, A. Bruce

Report Date : MAY 1966

Pagination or Media Count : 37

Abstract : A nondimensionalized structural optimization procedure is used to determine the effect on weight of specifying contrasting ring, stringer, and wall materials in J-stiffened, axially compressed cylinders. For conventional materials having modulus-to-density ratios of approximately 10 to the 8th power in., lighter elastic designs result when less dense materials are introduced anywhere in the design. Weight savings are proportional to the percentage of the lighter material used. However, since low-density materials usually have relatively low strengths, these materials are not efficient in plastic designs. Two nonconventional materials, beryllium and beryllium-38% aluminum, are studied in combination with aluminum. Aluminum rings may be used in otherwise beryllium or beryllium-38% aluminum designs with small weight penalties. At low loads, weights of designs with aluminum stringers and a beryllium or beryllium-38% aluminum wall, or vice versa, are about midway between the weights for all-aluminum and all-beryllium designs. At high loads, results depend heavily upon strength-density ratios. (Author)

Descriptors :   (*STIFFENED CYLINDERS, *WEIGHT), (*MATERIALS, STIFFENED CYLINDERS), BERYLLIUM ALLOYS, BERYLLIUM, ALUMINUM ALLOYS, ALUMINUM

Subject Categories : Metallurgy and Metallography
      Structural Engineering and Building Technology

Distribution Statement : APPROVED FOR PUBLIC RELEASE